Books and talks: autograph manuscript.
MLA
Dobson, Austin, 1840-1921. Books and talks: autograph manuscript.. Box 9. undated. https://collections.library.yale.edu/catalog/16626725.
APA, 6th edition
Dobson, Austin, 1840-1921. (["Box 9"])(undated)[Books and talks: autograph manuscript.]. https://collections.library.yale.edu/catalog/16626725.